Refrigerator unit



Oct. 18, 1932. BROWN v 1,883,759

REFRIGERATOR UNIT Filed Sept. 18, 1929 ArlhurEBrov/n.

Patented on. 18, 1932 STTES PATENT ric nnrmonmron um'r Application fileddeptember 18, 1928., Serial No. 893,437.

The principal objects of this invention are, to overcome the diihcultiesor maintaining the freezing chamber of a coolin unit intact as againstthe disrupting in uences of expansion and contraction due to change intemperature conditions, and further to provide means for retaining thelowtemperatures in a freezing chamber over sir-extended period.

The principal features of the nrention consist in the novel use of aheat ahsorbing medium in comminuted form mixed with a binding cement asan insulator tor a freezing chamber, and in the novel construction endan cooling coil whereby the contact between the coolireezing chamber isobing, one end of which is directly connected" to the expansion valve ofthe refrigerating system, which is notherein shown.

The convolutions of the coil 2 are formed oil a plurality of straightsections 3 arranged in progressively right angular relation andconnected by the bent loops which extend around the corners of therectangular casing in such a manner that there are no angles or sharpbendsand yet a very considerable length of tubing is arranged in closeparallel.

arran ement with the inner wall oi the treesing chamber,

A rectangular casing 5 spaced irorn the .inner casing l and also spacedthe convoiutions of? the coil 2 enclosed chainhcr around said inner coilend inner chancher and this closed chamber is tilled with a cement 6composed of iron, copgear hrass, aluminum or other metal fillingsintiniately mixed with a suitahle cementitious.

hinding material such lithargeu The terM end 'Z- oil the coil extendsout through the side wall of the casing 5 and forms the outer coolingcoil 8.

The convolutions of the coil 8 are supported on the tubular members 9,preferablyin heat interchange contact which members 9 are secured to thelongitudinal corners of the outer casin 5 and heat conducting vanes 10of suitable dimensions are secured to the outer coils.

The refrigerator element above described is arranged in any suitableform of refrigerator cabinet and the coil 8, external to the freezingchamber, absorbs heat directly from the surrounding atmosphere and trointhe vanes 10, but, the temperature of the refrigerating gases flowingthrough this coil is not suciently low to create frost of anyappreciable thickness on the surfaces.

The inner coil which receives the refrigerating gases when firstexpanded carries the refrigerator element at a temperature belowfreezing and this temperature is utilized to absorb the heat in theenclosed space within the inner casing or freezing chamber where gsrequiring to be reduced to a temperature below freezing are placed.

The looped corners ot the coil allow the expansion and contractionthereof without fracture and the filling of the space surrounding theinner casing with the comminuted metallic substance presents a heatabsorbing agent of such slow action as to form an efiect've insulationfor the interior chamber, but which will conduct a certain amount ofexternal temperatures to the cooler inner coils 2. i

This cement loaded with the comminuted metal particles takes the placeof the brine chamber that has been in common use and eliminates thedifliculties oi-expansion and contraction which eventually causeleakage.

An element such as described is very efiective in use It is cheap toconstruct and will not get out of order.

"W hat I claim as my invention is l. A refrigerating unit, comprising acasing a coil of tubing encircling said casing, a coil of tubing spacedfrom and encircling the former coil, said first-mentioned coil beingembedded in a solid filler of predetermined inner casing, a coil of pipeencircling saidheat exchange value disposed mainly on the outward sidethereof whereby a greater heat exchange will be effected between theembedded coil and the interior of the casing than bet-ween the embeddedcoil and the ex- I terior of the casing.

2. A refrigerating unit, comprising an inner casing having a pluralit ofstraight portions arranged parallel with the side of said casing, anouter coil forming a continuation of the inner coil, and a solidifiedfilling containing comminuted metal particles interposed between saidcoils and forming a heat exchange medium of predetermined value.

3. A refrigerator unit, comprising an inner casing, a coil of pipeencircl ng said inner casing and having straight portions in closeassociation with the side wall of the said casmg, an outer casing spacedfrom said inner casing-and enclosng said coils, a filler of comminutedmetallic substance mixed with a cementitious binding arranged betweensaid casings, and an outer coil encircling the outer casing andconnected with the inner coil.

4. A refrigeratoriunit as claimed in claim 3 in which said cementitiousbinding comprises litharge.

5. A refrigerator unit, comprising an inner casing, a 0011 of pipeencircling said inner casing having straight portions lying 1n closerelation to the walls thereof, an outer casing spaced from said innercasing and enclosing said coils, a fill ng of cojnminuted metal mixedwith a plastic cement encasing said coil and inner casing between saidinner and outer casings, and an outer coil encircling the outer casin 6.A refrigerator unit, compr. sing an inner casing, a coil encircling theinner casing, an outer casing enclosing said c011 and spaced from theinner casing, a filler of predetermined heat exchanging propertiesarranged between the casings, tubular members arranged longitudinally ofthe corners of the outer casing, a coil 'forming a continuation of theinner coil wound around the outer casing and in contact with thelongitudinal tubular members, and heat conducting vanes secured to theouter coil outside of the outer casin".

ARTHUR E. BROWN.

